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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec230ebc9ce853d7b0297d9848403d79876e54e95ea49de36d1c3dfa764af9b' 
  AND token = 'xQtEH8p48HM0OWg7nBHPiN0hwY3HsOoL3fjZvNQV78A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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