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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1abdda3cbbd954ca9f87fe0e5d7273dcb2cd3ccac7a22cb63a1ad680d202e2' 
  AND token = 'do474p5jIXKRmublF6u3i97a84dzioWLFBrOzw1auBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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