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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cae1957b88a371b19511c882b7475b5d796fdce226aa8ed751bf3b8852c02f' 
  AND token = 'At2DSDRC2SGQNUhNnbC17QoesSXXr3qHV4SjWf3q0UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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