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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a04a05ec4282f6dfab58528e8bd4475e4f57b82a79d1b18f9444ba7a331b05' 
  AND token = '07T8hIu55kl4zFxXtfLb/lV0FFte6nlNs6zdaO4BbjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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