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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f01476ee1d1bc5732e59d32c39b4bfa14297aa5e9eacb056ca2907c27b9827' 
  AND token = 'he9xFa34t1r2N6uYduLEphEYIMPY9DOLn3zJWYbDOS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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