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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5075944c266d755a525b7fe0bb4899386827e8ffa2a1a55cb2e4150452c198' 
  AND token = '+uozDpGjFhYfGU7JgLUFMMSN6xkJp0J2GT16em7grMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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