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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e510237a9b70a8f47293cfe8aedbc3c778d073aa9b4b0544df62fb6d85a512cf' 
  AND token = 'fwlWYEaF4fcggrkUxzIZVgr3ktIlDUBjigSBtJQpAFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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