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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1c123a09ded2a628041350635d04b2e7e3cf7cc90b75be4ffd165ea4a04e51' 
  AND token = '8dwkHVZyPyS8uAAMxFDcC4UAiM6SREu1s7efp8MyEvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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