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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bbdeabc2583b4c0d92f967660bf63d03afc54322ab814e5bed71e5489f0730' 
  AND token = 'K6C9Fj9PNnyAeGH3Ee6QNhdJyKdlnj1knlwlgRD8big=' 
  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"
    }
  }
}