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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd81b329ddf60e4fe56df0803ca13c6dc231eff91d894feefc00e1185a32b01' 
  AND token = 'vQxpoAvy6+bOQZ7W5WYEuAJx+Ifjh6kXRlnBRy1AvKA=' 
  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"
    }
  }
}