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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904948eb8a1c7b5d1e4bc7660988e6c6543f240cea721ae49e3a1851d2290846' 
  AND token = '2Pc/7In5DhbpKZnzPbI246qK+vuYA82EcnEL/JtQ/uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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