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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b817014b3a83ada7b23be9f12b0390f2c06e5bb5122f88b74050b8a76d69e9c5' 
  AND token = 'i3WZ0srWwn0+2joqfFr6N+IffA6bqzRGeralVmF2Pss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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