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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e77d1d375ad3fee55534b431410890a404c473104ef97ef5731e8fe1fdf2a07' 
  AND token = 'YT26RC2Rtf/PNF3L+2ihF+hI8m76rDGMUK4pVW3fBTk=' 
  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"
    }
  }
}