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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018f33baf55b678f0aad841c257f8fb2700c99f2341b7de249dfb1fad4a2f722' 
  AND token = 'q+c79T8A7CGSwytHntyiPEZ9Kx8VQ7NlyjZxGswTmB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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