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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3629b25abfee038ee6c479bf42a1d14e1d30fcb3074c0ed6d051dae6818ff839' 
  AND token = 'aScDiofOA5xn6tPjOaLJ8mIR0GiqAJ90beW6FgU0P5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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