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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd79d2510e59fc552b351236fa8cd96f4fb9d9872d1f5d0e4a60cb1617dd4ba7' 
  AND token = 'REVWNs6vNGOIe2MRqhvXLieu/EdvSkUgakDWSRmhpaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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