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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef4206b6b3d27aa291bddb2bca585614d127b856183a54b7544ea8c0234f776' 
  AND token = 'Pdqr3sDHWrIHfN1PUvMzirJV4lfm4aRUJr6Ol6KbHDs=' 
  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"
    }
  }
}