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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb6abcaf3fa19852545003f694045ba087b1a184343f90d36f2fe9caa21166b' 
  AND token = '1s9AJb3dI8DEUA6nFbuR85UyG2Nl6YzWrg4cK0MigYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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