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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd5c1471d6f4fa545d0c1e2a23ac51eead5e4bef10a8642a33524ff8608bbb8' 
  AND token = '6V8BRIiS8+8/Z+ImJgHcPBOC83K+vSTEUfhEVfz7kag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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