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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa9a8c14c28ba2ee396c6a2de1e7cbeec93d84b5a8a64ea2c135211ef9d2167' 
  AND token = 'zNOxYQN4bIMfKVVBUwBPGZHAnuvQrGGRHm0s0ktkd+0=' 
  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"
    }
  }
}