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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6205800a6277cc62d5374332d7a6d0d3ebc41ffcd6a40a3f2745f27b161d95f8' 
  AND token = 'nKmpTRaXfJj6VL3o62kxYLWfuk+yJnZ/BkmPq7e0tEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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