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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4c50617acfeb69769f9bab8f0d0496fc1c27662c2f1e239011a5177d9576dc' 
  AND token = 'UIH9YIeXCfpf9LUfrf2LRJLMo1JYM3MlC/Aja1m2+TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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