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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f804ce5bac92b64998b8c0c1818f5e0eceaa42ca282f4d089d72c93b6f1154aa' 
  AND token = '2AAk6sqdKWIEFezAQmTSk6unYs8EULMBlI1qMVw+XQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}