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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00bff9f9c0e7c9ccc7c2247cda85b9675b6e049c6851f80ce7f4092fa8b2d152' 
  AND token = 'w2aKv+mhKf3Im+s8RM/KG6z2ymtf5/zhmsQWEvo4G9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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