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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c3e05cd31ec37cd7255cd94f3947c92c94f439d272ea2c45aaefcaf884b19f' 
  AND token = 's3naTpUJ+WrsJT51F24GNZ0PsTwR/RoRCgBANvew+rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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