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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2e0b148f9dce9a3270e7820cad0010887ff17f263d6c0dac83c6ec5ad7d7c4d' 
  AND token = 'SAC+ohF1jOwg+dOykWl8xN7fPIFBTigy00g6AYQVUSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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