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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1daa74fe14ea0dc9d0aef6ed6a1bcb728a4e8c43cc1d2f5c9e52b3168d0e11' 
  AND token = 'kY4jzSCLNzkOJ8o37vtolDjvylBA5/nRqgbHOcYMmNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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