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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923909c61f0960b8364e7414bfe7264ad984b1653b9153cb0781e4e64dd30b16' 
  AND token = 'D7Q1KOT3Ea20rxLxeLTg3gfk2A3WDiJt3oCTzSR0CiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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