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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94aca4a2c70c2881574c94be45f402a7176b91f0db8fba3df74e2d6c61c4ce0c' 
  AND token = 'nv7A5IgaefYy+7tmEa/M5z4vGgQcKtiVOODivh8ota8=' 
  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"
    }
  }
}