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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634d14f3d325e6b20535b0de0497e09d4b3235ec6b39ba3cf4877911f9fa942b' 
  AND token = 'AfpCd2T2d3pDVK5OsV9kS7ssMfIbH/sD49MP36RBMGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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