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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2173bbce6dde8c7ae96ad7a8d58eb97e314bddae6b56309a8349d74db82902bb' 
  AND token = 'tkW5UlywkBWom0gbXsx8+cfozFP7o4L14VVrRLl0eKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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