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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2063eb8e3055e6eb24ad18bb3533438d31fd03a8c3291fa7c338950e371a1f16' 
  AND token = 'fe4OW8z+WqAfgGE6ZEKGGwAILPaSZAPQ2lRiaMMo4qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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