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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e69b22e8f8d807cce0cbe0c84fb970c99cba00865a2d1209b7afab1072ca672' 
  AND token = 'Hl6HIQU/Q/XNkvMq2W3AB0Jj/G4rNox1dPT0jW7pSRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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