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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa844418ced5cc2fa32e6f26431d5f86e8436808ae60917d5cd2a9f9e922c41' 
  AND token = '9sElvtAgtzvKx1Mfo6DZc8tMUUFHO4SHO4XGlW786Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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