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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7ef47d7b06d6867333e3a303d07fda126334b0ba4953ec22efbcc7b39594ec' 
  AND token = 'IuyGWuFHx8SJAu+QMcm+dOAOqU1343wGKGEAiGCgMq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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