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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7068f25eb220a5c88f106ab78db324b14a8e55f67ae69f3a7ac8ccc315f9ad0' 
  AND token = 'dAiKfDNc5lPyla3c4o/WLqkjB41PpEIs2REj9ubDIm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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