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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a81373d2f97deddef8547c0654ca35c2cf6f2b036c51f00de45c17c22dfe0e' 
  AND token = 'qJOCwNVWwLnjR8i7Ezx4/p2KLQu690J08T2724ug044=' 
  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"
    }
  }
}