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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08cafc7fe1964b04b76a774e3c73724d1bada2e41ff58b78f3b2fc8521af286' 
  AND token = 'faPOOw7G/piyjsKx4VrBupmIyhfMrhcfD4EsFnz6Ofg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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