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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64afb2ad5738d295f1a0632e8360445c71e46ab21859cf6723097f1aad7bde88' 
  AND token = 'qWCfdXBFuOWpG1FG+MATDOrFohk4kOLpihdzb2k6eTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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