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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f2a595fc294451913c0ecd1fb5c2ad39b9588c8004b344b3dd9e9fa22d4522' 
  AND token = 'YXb1l471nWimqY+Jjm0+Z4Nk4T7wQPcIpBeFfQw6gh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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